Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

The ritual has been performed uninterrupted for nearly 700 years.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This may be the last of London's wooden pavements, which were once a common sight in the city.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

Hear the quietest sound from across the dome.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

England's most famous front door has an accidental doppelganger.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.